Since upgrading to Lion i can no longer see other computers in my network and vice versa. What has gone on?

As the title suggests! I can no longer see any of the computers in my network, Mac or otherwise.
I have checked sharing permissions on all required computers and all seems to be good and have disabled firewalls.
I notice a few people have had similar problems with screen sharing but I am not even seeing another station to pottentialy share a screen with!
MBP 2.4GHz Intel Core 2 Duo
OS X - 10.7

Regarding the printer:
From: sterling r: https://discussions.apple.com/thread/5506493?tstart=0
If that does not help then from braden85:
This first article is about changing or updating printer software in Mountain Lion, and can be found here:
OS X Mountain Lion: Change or update printer software
http://support.apple.com/kb/PH10622
This next article tells you where to find the printer software for your specific printer brand:
OS X: Printer and scanner software available for download
http://support.apple.com/kb/ht3669

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    chief8451 wrote:
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    Regarding the printer:
    From: sterling r: https://discussions.apple.com/thread/5506493?tstart=0
    If that does not help then from braden85:
    This first article is about changing or updating printer software in Mountain Lion, and can be found here:
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    http://support.apple.com/kb/PH10622
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    Nathan Miah wrote:
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    or maybe install Snow Leopard using the disc it came on with my Mac and just set it up from a Time Machine Backup on my external hard drive (since it works under SL)?
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    Nathan Miah wrote:
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